I have an array that looks like this:
Array
(
[0] => [email protected] 20140827
[1] => [email protected] 20130827
[2] => [email protected] 20140825
[3] => [email protected] 20120825
[4] => [email protected] 20140826
)
Now I want to sort this array in php based on the numbers only so ignoring the e-mail address in the sort process.
For example, assuming entries are always like email space number:
usort($ary, function($a, $b) {
$a = intval(explode(' ', $a)[1]);
$b = intval(explode(' ', $b)[1]);
return $a - $b;
});
or in more complicated but efficient way using Schwartzian transform:
$ary = array_map(function($x) {
return [intval(explode(' ', $x)[1]), $x];
}, $ary);
sort($ary);
$ary = array_map(function($x) {
return $x[1];
}, $ary);
<?php
$data = Array(0 => '[email protected] 20140827',
1 => '[email protected] 20130827',
2 => '[email protected] 20140825',
3 => '[email protected] 20120825',
4 => '[email protected] 20140826'
);
$count_data = count($data);
for($i=0;$i<$count_data;$i++)
{
$new_data[trim(strstr($data[$i], ' '))]=$data[$i];
}
echo "<pre>"; print_r($new_data);
?>
this will return you
Array
(
[20140827] => [email protected] 20140827
[20130827] => [email protected] 20130827
[20140825] => [email protected] 20140825
[20120825] => [email protected] 20120825
[20140826] => [email protected] 20140826
)
Now you can sort according to need by Key
You could loop through the array, explode the string on a space, ' ', then set part one $explodedString[1] as the key in a new array, then use ksort on the new array.
Untested code.
$oldArr;
$newArr = array();
foreach($oldArr as $oldStr){
$tmpStr = explode(' ', $oldStr);
$newArr[$tmpStr[1]] = $tmp[0]; //You could use $oldStr if you still needed the numbers.
}
ksort($newArr);
Use substr_replace() to remove the unwanted prefix from a temporary copy of your array and sort the original array by that. Demo
array_multisort(
substr_replace($array, '', 0, -8),
$array
);
var_export($array);
Output:
array (
0 => '[email protected] 20120825',
1 => '[email protected] 20130827',
2 => '[email protected] 20140825',
3 => '[email protected] 20140826',
4 => '[email protected] 20140827',
)
If the number of characters at the end are variable, use whatever method you like to sanitize the strings. In this case, preg_replace('/.* /', '', $array) could have also been used.
ksortcannot help here.